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329 lines
8.6 KiB
329 lines
8.6 KiB
<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="theme-color" content="#375EAB">
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<title>errors - The Go Programming Language</title>
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<link type="text/css" rel="stylesheet" href="../../lib/godoc/style.css">
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<link rel="stylesheet" href="../../lib/godoc/jquery.treeview.css">
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<script type="text/javascript">window.initFuncs = [];</script>
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</head>
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<body>
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<div id='lowframe' style="position: fixed; bottom: 0; left: 0; height: 0; width: 100%; border-top: thin solid grey; background-color: white; overflow: auto;">
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...
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</div><!-- #lowframe -->
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<div id="topbar" class="wide"><div class="container">
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<div class="top-heading" id="heading-wide"><a href="http://localhost:6060/">The Go Programming Language</a></div>
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<div class="top-heading" id="heading-narrow"><a href="http://localhost:6060/">Go</a></div>
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<a href="index.html#" id="menu-button"><span id="menu-button-arrow">▽</span></a>
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<form method="GET" action="http://localhost:6060/search">
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<div id="menu">
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<a href="http://localhost:6060/doc/">Documents</a>
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<a href="http://localhost:6060/pkg/">Packages</a>
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<a href="http://localhost:6060/project/">The Project</a>
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<a href="http://localhost:6060/help/">Help</a>
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<a href="http://localhost:6060/blog/">Blog</a>
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<input type="text" id="search" name="q" class="inactive" value="Search" placeholder="Search">
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</div>
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</form>
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</div></div>
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<div id="page" class="wide">
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<div class="container">
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<h1>Package errors</h1>
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<div id="nav"></div>
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<!--
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Copyright 2009 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file.
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-->
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<!--
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Note: Static (i.e., not template-generated) href and id
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attributes start with "pkg-" to make it impossible for
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them to conflict with generated attributes (some of which
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correspond to Go identifiers).
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-->
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<script type='text/javascript'>
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document.ANALYSIS_DATA = null;
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document.CALLGRAPH = null;
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</script>
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<div id="short-nav">
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<dl>
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<dd><code>import "errors"</code></dd>
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</dl>
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<dl>
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<dd><a href="index.html#pkg-overview" class="overviewLink">Overview</a></dd>
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<dd><a href="index.html#pkg-index" class="indexLink">Index</a></dd>
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<dd><a href="index.html#pkg-examples" class="examplesLink">Examples</a></dd>
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</dl>
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</div>
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<!-- The package's Name is printed as title by the top-level template -->
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<div id="pkg-overview" class="toggleVisible">
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<div class="collapsed">
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<h2 class="toggleButton" title="Click to show Overview section">Overview ▹</h2>
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</div>
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<div class="expanded">
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<h2 class="toggleButton" title="Click to hide Overview section">Overview ▾</h2>
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<p>
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Package errors implements functions to manipulate errors.
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</p>
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</div>
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</div>
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<div id="example_" class="toggle">
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<div class="collapsed">
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<p class="exampleHeading toggleButton">▹ <span class="text">Example</span></p>
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</div>
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<div class="expanded">
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<p class="exampleHeading toggleButton">▾ <span class="text">Example</span></p>
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<p>Code:</p>
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<pre class="code">package errors_test
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import (
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"fmt"
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"time"
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)
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<span class="comment">// MyError is an error implementation that includes a time and message.</span>
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type MyError struct {
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When time.Time
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What string
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}
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func (e MyError) Error() string {
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return fmt.Sprintf("%v: %v", e.When, e.What)
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}
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func oops() error {
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return MyError{
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time.Date(1989, 3, 15, 22, 30, 0, 0, time.UTC),
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"the file system has gone away",
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}
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}
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func Example() {
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if err := oops(); err != nil {
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fmt.Println(err)
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}
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<span class="comment">// Output: 1989-03-15 22:30:00 +0000 UTC: the file system has gone away</span>
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}
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</pre>
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</div>
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</div>
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<div id="pkg-index" class="toggleVisible">
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<div class="collapsed">
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<h2 class="toggleButton" title="Click to show Index section">Index ▹</h2>
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</div>
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<div class="expanded">
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<h2 class="toggleButton" title="Click to hide Index section">Index ▾</h2>
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<!-- Table of contents for API; must be named manual-nav to turn off auto nav. -->
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<div id="manual-nav">
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<dl>
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<dd><a href="index.html#New">func New(text string) error</a></dd>
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</dl>
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</div><!-- #manual-nav -->
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<div id="pkg-examples">
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<h4>Examples</h4>
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<dl>
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<dd><a class="exampleLink" href="index.html#example_">Package</a></dd>
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<dd><a class="exampleLink" href="index.html#example_New">New</a></dd>
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<dd><a class="exampleLink" href="index.html#example_New_errorf">New (Errorf)</a></dd>
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</dl>
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</div>
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<h4>Package files</h4>
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<p>
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<span style="font-size:90%">
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<a href="http://localhost:6060/src/errors/errors.go">errors.go</a>
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</span>
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</p>
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</div><!-- .expanded -->
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</div><!-- #pkg-index -->
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<div id="pkg-callgraph" class="toggle" style="display: none">
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<div class="collapsed">
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<h2 class="toggleButton" title="Click to show Internal Call Graph section">Internal call graph ▹</h2>
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</div> <!-- .expanded -->
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<div class="expanded">
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<h2 class="toggleButton" title="Click to hide Internal Call Graph section">Internal call graph ▾</h2>
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<p>
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In the call graph viewer below, each node
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is a function belonging to this package
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and its children are the functions it
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calls—perhaps dynamically.
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</p>
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<p>
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The root nodes are the entry points of the
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package: functions that may be called from
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outside the package.
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There may be non-exported or anonymous
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functions among them if they are called
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dynamically from another package.
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</p>
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<p>
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Click a node to visit that function's source code.
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From there you can visit its callers by
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clicking its declaring <code>func</code>
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token.
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</p>
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<p>
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Functions may be omitted if they were
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determined to be unreachable in the
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particular programs or tests that were
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analyzed.
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</p>
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<!-- Zero means show all package entry points. -->
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<ul style="margin-left: 0.5in" id="callgraph-0" class="treeview"></ul>
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</div>
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</div> <!-- #pkg-callgraph -->
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<h2 id="New">func <a href="http://localhost:6060/src/errors/errors.go?s=294:321#L1">New</a></h2>
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<pre>func New(text <a href="../builtin/index.html#string">string</a>) <a href="../builtin/index.html#error">error</a></pre>
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<p>
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New returns an error that formats as the given text.
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</p>
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<div id="example_New" class="toggle">
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<div class="collapsed">
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<p class="exampleHeading toggleButton">▹ <span class="text">Example</span></p>
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</div>
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<div class="expanded">
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<p class="exampleHeading toggleButton">▾ <span class="text">Example</span></p>
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<p>Code:</p>
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<pre class="code">err := errors.New("emit macho dwarf: elf header corrupted")
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if err != nil {
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fmt.Print(err)
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}
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<span class="comment"></pre>
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<p>Output:</p>
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<pre class="output">emit macho dwarf: elf header corrupted
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</pre>
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</div>
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</div>
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<div id="example_New_errorf" class="toggle">
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<div class="collapsed">
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<p class="exampleHeading toggleButton">▹ <span class="text">Example (Errorf)</span></p>
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</div>
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<div class="expanded">
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<p class="exampleHeading toggleButton">▾ <span class="text">Example (Errorf)</span></p>
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<p>The fmt package's Errorf function lets us use the package's formatting
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features to create descriptive error messages.
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</p>
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<p>Code:</p>
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<pre class="code">const name, id = "bimmler", 17
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err := fmt.Errorf("user %q (id %d) not found", name, id)
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if err != nil {
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fmt.Print(err)
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}
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<span class="comment"></pre>
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<p>Output:</p>
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<pre class="output">user "bimmler" (id 17) not found
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</pre>
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</div>
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</div>
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<div id="footer">
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Build version go1.6.<br>
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Except as <a href="https://developers.google.com/site-policies#restrictions">noted</a>,
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the content of this page is licensed under the
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Creative Commons Attribution 3.0 License,
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and code is licensed under a <a href="http://localhost:6060/LICENSE">BSD license</a>.<br>
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<a href="http://localhost:6060/doc/tos.html">Terms of Service</a> |
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</div>
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</div><!-- .container -->
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</div><!-- #page -->
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<!-- TODO(adonovan): load these from <head> using "defer" attribute? -->
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<script type="text/javascript" src="../../lib/godoc/jquery.js"></script>
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<script type="text/javascript" src="../../lib/godoc/jquery.treeview.js"></script>
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